Check the listing for details. CLE-LINE C18925 Jobber Drill,3.50mm,Cobalt 53PR74. Condition: New. Listed at 3.07 USD. Jobber Length Drill Bit, Drill Bit Size 3.50 mm, Drill Bit Point Angle 135 Degrees , Cobalt, Straw/Bronze, Decimal Equivalent 0.1378, Metric, Drill Bit Point Type Split Point, Non-Coolant Through, Number of Coolant Holes 0 These drill bits have a straw/bronze finish that improves their wear resistance. They also have spiral flutes that evacuate chips as the bits drill into a workpiece.Cobalt jobber-length drill bits tolerate higher drilling speeds and are harder and more wear-resistant than high-speed steel drill bits. They provide some shock absorption and can be used in handheld power tools. Jobber-length drill bits are the most commonly used drill-bit length. They provide a good balance of strength and accuracy when drilling into a variety of materials.